VERTCRS["North Rona height",
    VDATUM["North Rona"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["United Kingdom (UK) - Great Britain - Scotland - North Rona onshore."],
        BBOX[59.07,-5.92,59.19,-5.73]],
    ID["EPSG",5745]]